// import { asyncRouterMap, constantRouterMap } from '@/router/index'
import { constantRouterMap, routerMap } from '@/router/index'
import { serverRouterMap } from '@/api/serverRouterMap'
/**
 * 通过meta.role判断是否与当前用户权限匹配
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
  if (route.meta && route.meta.role) {
    return roles.some(role => route.meta.role.indexOf(role) >= 0)
  } else {
    return true
  }
}

// 将本地routerMap映射到ajax获取到的serverRouterMap;
function generateAsyncRouter(routerMap, serverRouterMap) {
  serverRouterMap.forEach(function (item, index) {
    item.component = routerMap[item.component]
    if(item.children && item.children.length > 0){
      generateAsyncRouter(routerMap, item.children)
    }
  })
  return serverRouterMap;
}
/**
 * 递归过滤异步路由表，返回符合用户角色权限的路由表
 * @param asyncRouterMap
 * @param roles
 */
function filterAsyncRouter(asyncRouterMap, roles) {
  const accessedRouters = asyncRouterMap.filter(route => {
    if (hasPermission(roles, route)) {
      if (route.children && route.children.length) {
        route.children = filterAsyncRouter(route.children, roles)
      }
      return true
    }
    return false
  })
  return accessedRouters
}

const permission = {
  state: {
    routers: constantRouterMap,
    addRouters: []
  },
  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers
      state.routers = constantRouterMap.concat(routers)
    }
  },
  actions: {
    GenerateRoutes({ commit }, data) {
      return new Promise(resolve => {
        const { roles } = data
        let accessedRouters
        serverRouterMap().then(response => {
          var asyncRouterMap = generateAsyncRouter(routerMap, response.data.serverRouterMap)
          if (roles.indexOf('admin') >= 0) {
            accessedRouters = asyncRouterMap
          } else {
            accessedRouters = filterAsyncRouter(asyncRouterMap, roles)
          }
          commit('SET_ROUTERS', accessedRouters)
          resolve()
        })
      })
    }
  }
}

export default permission
